Filter for attachment to an ostomy bag

Details Filter for attachment to an ostomy bag Filter for attachment to an ostomy bag

1988-10-24

1990-07-10

Pellegrino, Stephen C.

Surgery

Means and methods for collecting body fluids or waste material

Receptacle attached to or inserted within body to receive...

553854, A61F 544

Patent

active

049404610

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a filter for attachment to an ostomy bag.
There has been proposed, in our U.K. Patent Application Serial No. 2 177 926, a filter housing forming part of a bag side element of an ostomy coupling. Within this filter housing is received a disc of a filter medium. One example of a suitable filter element is that disclosed and claimed in out U.K. Patent Application Serial No. 2 171 052. While in many circumstances it is convenient to have a filter housing integral with a bag side coupling element, for certain kinds of ostomy and similar bags for receiving discharged waste material from the human body, it is desirable to have a filter which is particularly adapted to be attached to the wall of an ostomy bag. One method of attachment is the use of an adhesive patch filter and another arrangement is the employment of a fold-over filter, see our U.K. Patent 2 122 090. In contrast to these suggestions, the present invention aims to meet the need for a filter which can be permanently attached to the bag but which nevertheless permits exchanging the filter medium.
According to the present invention, there is provided a filter for attachment to an ostomy bag and which comprises three parts, the first part including a synthetic plastics base member having a central aperture therein and one substantially flat surface whereby the filter can be attached by plastics welding or adhesive to a wall of the ostomy bag, there being two walls upstanding from the other side of the base member to define a channel and the inner wall defining with the base member a shallow recess, the second part being a pad consisting essentially of a filtering medium and having a height substantially equal to that of the recess and lateral dimensions such that it fits snugly within the recess, and the third part being a lid member of synthetic plastics material having a substantially flat top through which are provided a peripheral array of apertures, there being a wall extending from the flat top and having such a height, shape and width that it is a snug push fit within the channel; whereby the lid member is readily removable to allow replacement of the said pad.
In a preferred embodiment of the invention the channel and the wall on the lid member are of substantially circular formation.
In an advantageous embodiment of the invention, the wall on the lid member and/or one or both of the walls on the base member has a projection or a series of projections. These projections are positioned and dimensioned such that a snap fit can be achieved between the base and the lid members, and such that these members can be separated manually quite readily by the wearer.
In a particularly preferred embodiment of the invention, the lid member has a circular array of apertures located adjacent to and interiorly of the wall thereon, said wall being substantially cylindrical in shape so as to define a shallow cylindrical recess for receiving the filter medium in the form of a disc.
The wall on the lid member may have a radially outwardly extending rim so as to enhance its snap fit co-operation with the aforesaid channel.
The invention will be better understood from a consideration of the following description of an illustrative embodiment thereof, given with reference to the accompanying drawings, in which:
FIG. 1 is a front view of an ostomy bag including a filter in accordance with one example of the present invention;
FIG. 2 is a diagrammatic side view of the ostomy bag shown in FIG. 1;
FIG. 3 is a front view of the base member of an example of filter in accordance with the present invention;
FIG. 4 is a cross-sectional view on a line 4--4 in FIG. 3 of the base member;
FIG. 5 and FIG. 6 are respectively a front view and a side view of a filter pad for use in a filter according to the present invention;
FIG. 7 is a front view of a lid member for use in a filter according to the present invention;
FIG. 8 is a rear view of the lid member shown in FIG. 7, and
FIG. 9 is a cross-sectional view on the lines IX--IX of FIGS. 7 and 8.
The illust

REFERENCES:
patent: 3850326 (1974-11-01), Ryles
patent: 4411659 (1983-10-01), Jensen et al.
patent: 4451258 (1984-05-01), Jensen
patent: 4460363 (1984-07-01), Steer et al.
patent: 4460392 (1984-07-01), Poulsen et al.
patent: 4516974 (1985-05-01), Davis
patent: 4668258 (1987-05-01), Steer
patent: 4723951 (1988-01-01), Steer

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